[MrForbes]

We used the chassis-in-a-day, with single speed single reduction gearboxes and traction wheels with versa hubs. The gearboxes are working fine, although there was a bit of confusion during assembly, as the instructions didn't mention that one part was a press fit. Paul was quick to help by email, but it appears the instructions have not been updated? The wheels are a very clever design, I like the versa hubs, but we have had problems with the screws. It was not obvious that we needed to order a specific size of screw to attach the sprockets to the wheels, but we were able to use some of the left over screw assembly wheels for the sprockets. Unfortunately these screws are rather soft steel with button heads, and it's easy to strip the hex, and it's not easy to get them tight enough to not come apart. Thread locker would help. It would also help if the necessary screw lengths were noted on the ordering page on the web site. Perhaps add a drawing that shows how the wheels and hubs are assembled for the various configurations, noting what length screws are needed for different sprocket stacks. Or let us know that we'll have to spend some time figuring this out after we get the parts, and that we'll probably have to do some additional parts ordering to get the correct screws for our application.

I really like a lot of aspects of the design of the wheels, sprockets, hubs, axles, etc. It's obvious that many years of robotics experience went into the design of these parts.